Drill-chuck



(No-Model.)

0. K. SCHMIDT.

DRILL CHUCK.

Patented Feb. 6, 1894.

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NITED STATES.

PATENT OFFICE.

OSCAR K. SCHMIDT, OF ST. LOUIS, MISSOURI, ASSIGNOR OF TWO-THIRDS TO ROBERT KLAU AND GUSTAV POHLIG, OF PHILADELPHIA, PENNSYLVANIA.

DRILL-CHUCK.

SPECIFICATION forming part of Letters Patent No. 514,165,. dated February 6, 1894.

Application filed \Tune 10, 1893. Serial No. 477.248- (No model.)

To aZZ whom it may concern.-

Be it known that I, OSCAR K. SCHMIDT, of the city of St. Louis, State of Missouri, have invented certain new and useful Improvements in Drill-Chucks, of which the following isa full, clear, and exact description, reference being had to the accompanying drawings, forming a part hereof.

My invention has relation to improvements in drill chucks, and consists in the novel ar rangement and combination of parts more particularly set out in the specification and pointed out in the claims.

. In the drawings, Figure 1 is a side elevation of my complete invention. Fig. 2' is a vertical transverse section taken on the line m-a: of Fig. 1. Fig. 3 is a horizontal cross section taken on the line y-y of Fig. 1. Figs. 4 and 5 are side elevations of the nuts which I employ in carrying out my invention; and Figs. 6 and 7 are side elevations showing the adjustable nuts for lengthening the chuck.

My invention consists essentially in the employment of various sizes of lengthening nuts and screw-threaded bolts, in combination with other details hereinafter described.

Referring to the drawings, 1 represents a screw-threaded bolt upon which the various detachable parts are screwed and secured together. Secured to the lower end of said bolt or screwed upon the same is a nut 2 the upper portion 3 of which is round in cross section, and formed in the lower end of said nut is a socket 4 for receiving a drill of well known construction.

. 5 represents asecond nut having a rounded portion 6, and screwed upon the bolt 1 and interposed between the nut 2 and nut 5 is a ratchet toothed plate 7 which is held in a locked position upon the bolt, after the said nuts have been screwed against the same.

8 represents an operating handle having an enlarged end 9 and bifurcated as shown in Fig. 1.

10, 10 represent the bifurcations having circular openings 11 formed therein to receive the rounded portions 3 and 6 of the nuts 2 and 5 respectively, the space between said bifurcations being of such a size as to receive the ratchet toothed plate 7.

of the chuck in one direction, but caused to turn said chuck when operated in the reverse direction.

Screwed upon the upper or projecting end of the screw threaded bolt 1 is a long nut 14 which is adjustable to and from the nut 5, and screwed within the screw-threaded bore 15 of said nut is a plug 16 having a conical end 17 which end is adapted to be brought in contact with any suitable brace, such as generally used for such purposes.

In operating the chuck, the drill carried by the same is fed to the material to be operated upon by the application of an ordinary wrench to the nut let which causes said nut to move from the nut 5 thereby lengthening the chuck as necessity demands. When it is desired to greatly lengthen the chuck, a bolt of greater length is employed and nuts such as shown in Figs. 6 and 7 are used in connection with said bolt. 7 It is also necessary in some instances to lengthen the lower end of the chuck, which can be accomplished by the employment of a longer nut such as 2, the length of the chuck howeverdepending entirely upon the length of the bolt 1, and nuts 2 and 14.

Having described my invention, what I claim is 1. Achuck comprisingabolt, a nut2 screwed upon one end of the same and forming a socket for the drill, a ratchet toothed plate also screwed upon said bolt and brought in contact with the said nut, a nut 5 screwed upon said bolt and against the said plate, an operating handle movable upon the nuts 2 and 5 and held in position by the said plate, a spring pawl engaging with said plate, a nut 14 adjustable upon said bolt for lengthening the chuck, and a screw threaded plug having a conical end screwed into one end of the said dle and engaging with said toothed plate, a nut 14, substantially as set forth. nut 14 adjustable upon the opposite end of 2. A chuck comprising a bolt 1, a nut 2 said bolt, and ascrew-threaded plug screwed 15 screwed upon one end of the same and havinto the said nut 14 and havingaconical end, 5 ing a rounded portion 3, a ratchet toothed substantially as set forth.

plate also screwed upon said bolt, a nut 5 hav- In testimony whereof I afiix my signature in ing a rounded portion 6, an operating handle the presence of two Witnesses.

8 havin an enlar ed portion 9 and bifurcations 10: circular gpenings 11 formed in said OSCAR SCHMIDT xo bifurcations for receiving the rounded por- Witnesses:

tions 3 and 6 of the nuts 2 and 5 respectively, JAMES J. ODONOHOE,

a spring actuated pawl carried by said han- EMIL STAROK. 

